In a passcode-locked iPhone with latest iOS 12.1 You receive a phone call, or you ask Siri make a phone call (can be digit by digit), and, by changing the call to FaceTime you can access to the contacts list and by doing 3D Touch on each contact you can see more contact information, and doing tap on the contact phone number, allows start a new phone call.Feature or Flaw?Note: Turn on Airplane mode is not needed, it's for to get time for to navigate on Contacts.